Henry John Keupper (July 24, 1887 – August 14, 1960), was a professional baseball player who played pitcher in the Major Leagues in 1914.

He would play for the St. Louis Terriers.

Keupper played semi-professional baseball in Southern Illinois until friends recommended him to Frank Donnelly, manager of the Peoria Distillers, who happened to be in Southern Illinois on a hunting trip.

His proponents compared him to Orval Overall and Donnelly gave him his first job in professional baseball with the Distillers.

This biographical article relating to an American baseball pitcher born in the 1880s is a stub.